Servo control system
First Claim
1. A servo control system comprising:
- a servo motor;
current control means responsive to a velocity command signal for supplying a drive current to said servo motor;
position and velocity control means, physically separated from said current control means, responsive to a position command signal and a signal representing a current position and velocity of said servo motor for supplying the velocity command signal to the current control means; and
communication means provided between said current control means and said position and velocity control means for transmitting data between said current control means and said position and velocity control means by means of a bidirectional data communication line, said communication means including a first bidirectional communication interface provided in said position and velocity control means and a second bidirectional communication interface provided in said current control means.
1 Assignment
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Accused Products
Abstract
There are provided a position and velocity control system for producing a velocity command signal in response to a position command signal and a signal representing a current position and velocity of a servo motor, a current control system for supplying a drive current to the servo motor in response to the velocity command signal, and a communication system for transmitting data between the two systems by means of a bilateral communication line. A servo control system is thereby separated between the current control system and the position and velocity control system and connected to each other through the communication system. This separation through the communication system is advantageous for protecting the position and velocity control system from influence of noise generated in the current control system and also brings about benefits such as expansion of the controllability owing to the bilateral communication, sharing of a single current control system by plural servo motors by switching connection of the servo motors and controllability of plural pairs of servo motor and current control system by a single position and velocity control system by a multi-point connection.
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Citations
13 Claims
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1. A servo control system comprising:
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a servo motor; current control means responsive to a velocity command signal for supplying a drive current to said servo motor; position and velocity control means, physically separated from said current control means, responsive to a position command signal and a signal representing a current position and velocity of said servo motor for supplying the velocity command signal to the current control means; and communication means provided between said current control means and said position and velocity control means for transmitting data between said current control means and said position and velocity control means by means of a bidirectional data communication line, said communication means including a first bidirectional communication interface provided in said position and velocity control means and a second bidirectional communication interface provided in said current control means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A servo control system;
- comprising;
a servo motor; current control means responsive to a velocity command signal for supplying a drive current to said servo motor; position and velocity control means, physically separated from said current control means, responsive to a position command signal and a signal representing a current position and velocity of said servo motor for supplying the velocity command signal to the current control means, comprising an absolute type and phase-shift type position sensor for detecting a current position and velocity of said servo motor including a coil winding section and a member which displaces relative to said coil winding section to change reluctance in said coil winding section in accordance with the relative position of said member with respect to said coil winding section, said coil winding section being excited by primary ac signals which are phase-shifted to one another to generate an output ac signal having an electrical phase difference corresponding to the absolute position of said servo motor; and communication means provided between said current control means and said position and velocity control means for transmitting data between said current control means and said position and velocity means by means of a bidirectional data communication line. - View Dependent Claims (13)
- comprising;
Specification